This is awful but know that this kind of thing os quite rare with CSA farms. 95%+ deliver the good every week without fail or if they don't communicate with their CSA community as to why food is not coming forth.
I have noticed over the years when I see complaints like this either the CSA farm is under 3 years old and the farmer simply doesn't know what they are doing. Being a CSA farmer is a high skill job and it takes at least 4 years to get decent at the job and that is with an experienced farmer. many people are joining CSA's that are run by newbie farmers who will have a very difficult time getting through a season and seem to get very embarrassed by the failures and quits talking to the membership. These people are not bad people just people who have bitten off way more than they can chew.
But they are not typical of CSA at all.
My suggestion is join another CSA but this time do some homework before shelling out money. Ask how long they have been farming and how long they have been doing a CSA. If it is under 4 years find another farm. Ask the farmer(s) if you can contact current and past members and if they say yes do but realize that most will not respond to an email. You will have better luck calling them on the phone.
As I have said the vast majority of CSA deliver what their members have paid for week after week, year after year but in any industry there are a few bad apples and it is a shame you guys have found one of them.